Finding the Fourth Proportional to 2,086.14, 3,128.91 and 787.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.14 : 3,128.91 = 787.32 : x
2. Step 2: Convert to fraction form
   2,086.14/3,128.91 = 787.32/x
3. Step 3: Cross multiply
   2,086.14x = 3,128.91 × 787.32
4. Step 4: Simplify right side
   2,086.14x = 2,463,453.42
5. Step 5: Solve for x
   x = 2,463,453.42/2,086.14
6. Step 6: Final answer
   x = 1,180.87